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• How to convert the time difference to hours(with 2 decimal place) in derby?

  - by jl

  Hi, I am using timestampdiff in derby db to retrieve the time difference between 2 time: startdate, and enddate. e.g. startdate = 2010-02-23 02:59:52.045 enddate = 2010-02-23 03:45:39.898 select {fn timestampdiff(SQL_TSI_HOUR, startdate, enddate)} as diff I would like to know how can I get the time diff in hours, e.g. 0.25, etc? Thank you.

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• CONCAT_WS rows in JOIN

  - by Alex Kiselev

  i have tables profiles (id, name, deleted) categories (id, name, deleted) profiles_categories (id, profile_id, category_id, , deleted) I have wrong query SELECT p.id, p.name CONCAT_WS(', ', c.name) AS keywords_categories FROM profiles p LEFT JOIN profiles_categories pc ON p.id = pc.profile_id LEFT JOIN categories c ON pc.id = c.id WHERE p.deleted = FALSE So, i want have result with all profiles with concan categories.name. Thanks

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• SELECT Data from multiple tables?

  - by Kyle R

  I have 3 tables, with 3 fields all the same. I basically want to select information from each table For example: userid = 1 I want to select data from all 3 tables, where userid = 1 I am currently using: SELECT r.*, p.*, l.* FROM random r LEFT JOIN pandom p ON r.userid = p.userid LEFT JOIN landom l ON l.userid = r.userid WHERE r.userid = '1' LIMIT 0, 30 But it doesn't seem to work.

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• What is the best practise for relational database tables in mysql?

  - by George

  Hi, I know, there is a lot of info on mysql out there. But I was not really able to find an answer to this specific and actually simple question: Let's say I have two tables: USERS (with many fields, e.g. name, street, email, etc.) and GROUPS (also with many fields) The relation is (I guess?) 1:n, that is ONE user can be a member of MANY groups. What I dis, is create another table, named USERS_GROUPS_REL. This table has only two fields: us_id (unique key of table USERS) and gr_id (unique key of table GROUPS) In PHP I do a query with join. Is this "best practice" or is there a better way? Thankful for any hint!

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• SQL Syntax for multiple conditions in the same field

  - by Jonathan

  I can't seem to find this in the mysql manual: How do you enter multiple conditions for the same field in a select statement? e.g.: SELECT * FROM table WHERE ID = '1, 2, 3, 4' Is there a way to do this without using this: SELECT * FROM table WHERE ID = '1' OR ID = '2' OR ID = '3' OR ID = '4'

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• Selecting all tables with no records

  - by sqlgrasshopper5

  I need to display all tables that have zero records. I tried, select * from user_all_tables where (select count(*) from user_all_tables)=0; But it doesn't seem to work. How should I go about redesigning this query? Thanks.

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• How to deal with 2 almost identical tables

  - by jgritty

  I have a table of baseball stats, something like this: CREATE TABLE batting_stats( ab INTEGER, pa INTEGER, r INTEGER, h INTEGER, hr INTEGER, rbi INTEGER, playerID INTEGER, FOREIGN KEY(playerID) REFERENCES player(playerID) ); But then I have a table of stats that are basically exactly the same, but for a team: CREATE TABLE team_batting_stats( ab INTEGER, pa INTEGER, r INTEGER, h INTEGER, hr INTEGER, rbi INTEGER, teamID INTEGER, FOREIGN KEY(teamID) REFERENCES team(teamID) ); My first instinct is to scrap the Foreign key and generalize the ID, but I still have a problem, I have these 2 tables, and they can't have overlapping IDs: CREATE TABLE player( playerID INTEGER PRIMARY KEY, firstname TEXT, lastname TEXT, number INTEGER, teamID INTEGER, FOREIGN KEY(teamID) REFERENCES team(teamID) ); CREATE TABLE team( teamID INTEGER PRIMARY KEY, name TEXT, city TEXT, ); I feel like I'm overlooking something obvious that could solve this problem and reduce stats to a single table.

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• does mysql undo changes if you kill thread?

  - by every_answer_gets_a_point

  i ran a delete rows query. it was taking too long so i killed the thread from administration. did it undo the changes to the table/?

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• Select a record that has a duplicate

  - by Josh K

  I'd like to select all records from a table (names) where lastname is not unique. Preferrably I would like to delete all records that are duplicates. How would this be done?

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• How to do Group By in grails to order by Count(*)

  - by skurt

  How do I translate: SELECT COUNT(*) AS `count`, `a` FROM `b` GROUP BY `a` ORDER BY `a` into grails or gorm query?

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• Load huge sql dump to mySql

  - by jonathan

  Hi I have a huge mysql dump file generated from phpmyAdmin (150 000 lines of create table, inserts....) The mySql query tool fails to open such a big file. As a result i can't insert all the records. Is there a way to do this ? Thanks John

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• Query to select from two different tables

  - by ryan

  I would like to select from two tables and display my result using this query: CREATE TABLE Buy_Table ( buy_id int identity primary key, user_id int, amount decimal (18,2) ); go INSERT INTO Buy_Table (user_id, amount) VALUES ('1', 10), ('1', 8), ('1', 20), ('3', 1), ('2', 2); go CREATE TABLE Sell_Table ( sell_id int identity primary key, user_id int, amount decimal (18,2) ); go INSERT INTO Sell_Table (user_id, amount) VALUES ('1', 10), ('1', 8), ('1', 20), ('3', 3), ('2', 3); go select [user_id], 'Buy' as [Type], buy_id as [ID], amount from Buy_Table union all select [user_id], 'Sell', sell_id, amount from Sell_Table order by [user_id], [ID], [Type] However the above query will return each row of the user_id like this I want to display my result to something like this in a grid: Can this be done in query itself rather manipulating the grid? Thx

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• Table Design for (Currently Viewing Videos)?

  - by Surya sasidhar

  hi, I am doing a project on video portal, in that i am trying to place for currently viewing videos. People who r currently viewing that video. For this i have design the table like this table:(columns) Sno,videoid,sessionid,userid,createddate these are the columns but it is not sufficient i think if possible can u help me how can i design the table. how can we perfectly represent the currently viewing videos. Please help me thank you

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• How to pass and Return a Array to stored procedure?

  - by padmavathi

  I would like to know how to pass an array to a stored procedure which in turn will return an array from c# .net? Thanks& Regards Padma

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• what does this ADO OPEN Method do?

  - by every_answer_gets_a_point

  in plain english can you explain to me what happens here: rs.Open "batchinfo", oConn, adOpenKeyset, adLockOptimistic, adCmdTable what i need to do is to be able to insert values into a table called batchinfo. would this be the best way to do an OPEN? the only thing i would be doing is inserting values.

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• Caluculating sum of activity

  - by Maddy

  I have a table which is with following kind of information activity cost order date other information 10 1 100 -- 20 2 100 10 1 100 30 4 100 40 4 100 20 2 100 40 4 100 20 2 100 10 1 101 10 1 101 20 1 101 My requirement is to get sum of all activities over a work order ex: for order 100 1+2+4+4=11 1(for activity 10) 2(for activity 20) 4 (for activity 30) etc. i tried with group by, its taking lot time for calculation. There are 1lakh plus records in warehouse. is there any possibility in efficient way. SELECT SUM(MIN(cost)) FROM COST_WAREHOUSE a WHERE order = 100 GROUP BY (order, ACTIVITY)

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• How do I delete every row except the last one for each day?

  - by A B

  I have a table with stock quotes that looks something like this: id, date, stock_id, value Every day has several rows for each stock_id (it is automatically updated every five minutes), so the table is rather big at the moment. How do i delete every row but the last one each day for every stock_id?

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• Does this behavior exist in all major databases?

  - by user198729

  mysql> select 0.121='0.121'; +---------------+ | 0.121='0.121' | +---------------+ | 1 | +---------------+ Does it hold for other database that number='number' is true?

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• insert values with different delimiter

  - by every_answer_gets_a_point

  i want to insert values into a table, with an INSERT INTO statement but i would like to use a different delimiter (not a comma) how do i do this?

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• ms-access: designing a report: printing text on specific x,y coordinates

  - by every_answer_gets_a_point

  i need to design a report that will print text on specified x,y coordinates for example, i will input (50,50), (60,60), (70,70) and i will have my program print text at those specific coordinates on the report. in total there will be about 50 different coordinates. how do i achieve this? should i be using a label control or a textbox? should i be creating the controls dynamically or should i already have controls set at the specified regions?

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• TSQL to Map User to Database

  - by dtrick

  So I'm not able to user enterprise manager to do this... If I was I wouldn't even be asking this question. So I'm wondering if there is a way through TSQL to execute a command that maps a User to a particular Database and grants them 'owner' permissions. Thanks...

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• MySQL join not returning rows

  - by John

  I'm attempting to create an anti-bruteforcer for the login page on a website. Unfortunately, my query is not working as expected. I would like to test how many times an IP address has attempted to login, and also return the ID of the user for my next step in the login process. However, I'm having a problem with the query... for one thing, this would only return rows if it was the same user as they had been trying to login to before. I need it to be any user. Secondly, regardless of whether I use LEFT JOIN, RIGHT JOIN, INNER JOIN or JOIN, it will not return the user's ID unless there is a row for the user in login_attempts. SELECT COUNT(`la`.`id`), `u`.`id` FROM `users` AS `u` LEFT JOIN `login_attempts` AS `la` ON `u`.`id` = `la`.`user_id` WHERE `u`.`username` = 'admin' AND `la`.`ip_address` = '127.0.0.1' AND `la`.`timestamp` >= '1'

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• SQL query for selecting most recent entries

  - by Mr_Skid_Marks

  A table in my database has a column, DATE_ADDED (stored in seconds). I want to extract all rows with the most recent date (aka largest value for DATE_ADDED). The only solution I have come up with is to SELECT all the rows in ASC (ascending) order, grab the last entry from the table, check the date on this, and perform another SELECT on the table but this time only for the discovered DATE_ADDED. Is it possibly to simplify this series of queries into a single one? My thought is I should be able to do a SELECT on all of the largest values in the table, but I am struggling to come up with a proper query.

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• Check mysql_query results if DELETE query worked?

  - by Camran

  I have a DELETE query which deletes a record from a mysql db. is there any way to make sure if the delete was performed or not? I mean, for a query to FIND stuff you do $res=mysql_query($var); $nr=mysql_num_rows($res); and you get nr of rows returned. Is there any similiar method for deletion of records? Thanks

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• Traversing ORM relationships returns duplicate results

  - by NKing253

  I have 4 tables -- store, catalog_galleries, catalog_images, and catalog_financials. When I traverse the relationship from store --> catalog_galleries --> catalog_images in other words: store.getCatalogGallery().getCatalogImages() I get duplicate records. Does anyone know what could be the cause of this? Any suggestions on where to look? The store table has a OneToOne relationship with catalog_galleries which in turn has a OneToMany relationship with catalog_images and an eager fetch type. The store table also has a OneToMany relationship with catalog_financials.

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